Our site is set up to access through a CDN.  

When a WFFM Form is submitted with image sizes of 3MB, it returns a "413 Request Entity Too Large" status error. 

I have found, in online documentation, that this error may suggest a file upload limit of the CDN, but our hosting provider has told us that it is a result of too much information in the `Request Payload` headers from the WFFM submission. He has recommended that we try to trim the headers on form submission requests.

i.e. 

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/5YgN9.png


Does this sound like it could be the issue? Any details to help explain the issue or to help with actually trimming these headers would be greatly appreciated.